There was a Wayne Lyons sighting at Thursday’s practice and it wasn’t a good sight to see. Lyons, Stanford’s talented true freshman defensive back, has a possible fracture in his left foot. Lyons, out of Dillard High in Fort Lauderdale, Fla., has played well in both of the Cardinal’s games and has added needed depth in the defensive backfield. Lyons will miss Saturday’s Pac-12 opener with Arizona, at least.

“It will be a few weeks for Lyons,” Stanford coach David Shaw said. “That’s what they’re saying.”

Shaw didn’t see the injury occur. In fact, Shaw didn’t realize Lyons was hurt until after the Cardinal’s game with Duke on Saturday.

“Lyons finished the game and was doing fine,” Shaw said. “He had a little bit of pain and it didn’t seem like that big of a deal. The pain got worse and he got it checked it out. It might have happened before the game. I’m not exactly sure. The game might have made it worse. Watching the film, he was still explosive and running fast.”

Looking for quick start: Shaw is looking for Stanford to improve from its first two games.

“We, as a team, need to play a 60-minute game,” Shaw said. “We started better last week than the week before, but we didn’t play a complete first half. We’re going to play against a good team in their home. We need to come out and play better at the very beginning.”

Shaw pumped up the music at Thursday’s practice to simulate the crowd noise that raucous Arizona Stadium presents.

“It’s loud,” Shaw said. “There is a lot of energy in that stadium. Their student section is noticeable. They’re loud and into it. It’s a tough place to play.”

This and that: Shaw has been pleased with the timing of the offense, which is averaging 50.5 points per game, fifth in the nation.

“The timing of our offense has been good,” Shaw said. “We allowed the quarterback to get hit too many times last week. As far as the rhythm of what we’re doing, I thought last week was good. We just didn’t make enough plays.”

Shaw liked Tuesday’s practice better than Wednesday’s.

“Wednesday was great, (today) was good,” Shaw said. “We need to practice with a little more speed than we did (today). We let the players know that and it got better at the end.”

Shaw will rotate his offensive line Saturday, especially to ward off the expected 90-degree plus heat, despite a 7:45 p.m. start.

“We’ll do something with the heat and make sure the guys stay fresh,” Shaw said. “We have two guys (on the bench) — Kevin Danser and Tyler Mabry — who are starters. We consider Mabry a starter. The battle was close until the end. Kevin Danser was a starter the entire spring ball, then entire training camp until he had his dehydration.”

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